Remove Overlapping dates for the same ID

and pls try this code

let
f= (x as table)=> [
       a = Table.AddColumn(x,"reg",   
       each [  e = List.Max( List.RemoveLastN(x[End Date],(x)=>x<>[End Date])),
               f = if [End Date] < e then null else e][f]),
       b = Table.SelectRows(a, each [reg]<> null)][b],
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("fdBLDoAgDEXRvTDWpC3/oW6DsP9tCH7wYROHNyekLaWYzSxG4kpuFRLXglv4K+pyewKHeLz182SK4Qk9KWcCZ9bzGVzC5Ht/4nD/PO23f++DGP5zX3fC+SRqPll0q336H689oOv7KKJH7T//e3pGf6PWAw==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, #"Start Date" = _t, #"End Date" = _t]),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Name", type text}, {"Start Date", type date}, {"End Date", type date}}),
#"Grouped Rows" = Table.Group(#"Changed Type", {"Name"}, {{"Table",(x)=>f(x)
}}),
    #"Removed Other Columns" = Table.SelectColumns(#"Grouped Rows",{"Table"}),
    #"Expanded Table" = Table.ExpandTableColumn(#"Removed Other Columns", "Table", {"Name", "Start Date", "End Date"})
in
    #"Expanded Table"

In which case:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("XdC7DcAgDEXRXagpbD4JLpM1EPuvEYmYpwfVFacwht7DE2IotYj9TRZGhKqgrBdKmgRlTd7MmrO3TX3nKZvPFSXFZmKsx2ZL1Zs29du0bFpR1vW2e9OGshpKevzDUkXH+AA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, #"Start Date" = _t, #"End Date" = _t]),
    ChangedType = Table.TransformColumnTypes(Source,{{"Start Date", Int64.Type}, {"End Date", Int64.Type}}),
    ChangedType1 = Table.TransformColumnTypes(ChangedType,{{"Start Date", type date}, {"End Date", type date}}),
    AddedCustom = Table.AddColumn(ChangedType1, "Custom", each {Number.From([Start Date])..Number.From([End Date])}),
    RemovedOtherColumns = Table.SelectColumns(AddedCustom,{"Name", "Custom"}),
    ExpandedCustom = Table.ExpandListColumn(RemovedOtherColumns, "Custom"),
    RemovedDuplicates = Table.Distinct(ExpandedCustom),
    SortedRows = Table.Sort(RemovedDuplicates,{{"Name", Order.Ascending}, {"Custom", Order.Ascending}}),
    AddedIndex = Table.AddIndexColumn(SortedRows, "Index", 0, 1, Int64.Type),
    InsertedSubtraction = Table.AddColumn(AddedIndex, "Subtraction", each [Custom] - [Index], type number),
    GroupedRows = Table.Group(InsertedSubtraction, {"Name", "Subtraction"}, {{"Start", each List.Min([Custom]), type number}, {"End", each List.Max([Custom]), type number}}),
    ChangedType2 = Table.TransformColumnTypes(GroupedRows,{{"Start", type date}, {"End", type date}}),
    RemovedColumns = Table.RemoveColumns(ChangedType2,{"Subtraction"}),
    SortedRows1 = Table.Sort(RemovedColumns,{{"Name", Order.Ascending}, {"Start", Order.Ascending}})
in
    SortedRows1